“Any steel coming into the United States is going to have a 25% tariff,” he told reporters Sunday on Air Force One as he flew from Florida to New Orleans to attend the Super Bowl. When asked about aluminum, he responded, “aluminum, too” will be subject to the trade penalties.

One of Ukraine’s largest steel plants lies in the country’s industrial east, where Russia’s 3-year invasion of its neighbor threatens to throttle production at any moment.

The president, who has threatened and delayed other tariffs, said he will announce the measures Monday. Canada and Mexico are among the top U.S. steel suppliers.

U.S. President Donald Trump says he has agreed to consider a tariff exemption on Australian steel and aluminum imports after a telephone conversation with Australia’s prime minister.